Storage battery.



UNITED snares reruns THOMAS A. EDISON, OF LLEWELLYN PARK, ORANGE, 'NEW JERSEY, ASSIGNOR TC- EDISON STORAGE BATTERY COMPANY, OF WEST ORANGE, NEW JERSEY, A. COR- PORATION OF NEW JERSEY.

STOEAGE BATTERY.

Ho Drawing.

To all whom it may concern: Y

Be it known that I, Tnonms ALVA EnrsoN, a citizen of the United States, residing at Llewellyn Park, Orange, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Storage Batteries, of which the following is a specification.

In Letters Patent of the United. States, No. 873,220, dated December 10, 1907, and No. 946,540, dated January 18, 1910, I described certain improvements in storage batteries, in which alkaline electrolytes are used and in which the active depolarizing material consists of an oxygen compound of nickel to which an oxygen compound of hismuth is added, which results in a substantial increase in the capacity of the cell.

My present invention relates to an improved process for preparing the depolar izing material, whereby a more intimate mixture of the oxygen compounds of nickel and bismuth is obtained, and the segregation of either of the compounds is prevented.

In carrying my invention into effect, and

assuming that the process is to be utilized commercially in connection with the manufacture of the depolarizing material before the latter is introduced into the receiving pockets, or otherwise utilized in connection with the make-up of electrodes of storage batteries, I proceed substantially as follows: Nickel hydroxid is precipitated from a suitable solution and while the precipitate or pulp is being stirred, a pulp of recently precipitated bismuth hydroxid, which has not been dried, is added. The stirring of the resulting pulp is continued until the two precipitates, namely, the nickel hydroxid and the bismuth hydroxid, are thoroughly mixed together. The pulp is then dried, and after it is dried, it is thoroughly washed and then redried. The resulting dry mixture is then ready for use, and may be introduced into the receiving pockets, or used in connection with the make-up of the electrodes of storage batteries in any suitable way.

Bismuth hydroxid when dried becomes anhydrous, and if it were permitted to dry before mixing itwith the nickel hydroxid,

Specification of Letters Patent.

Application filed January 27, 1911.

Patented July 30, 1912.

Serial No. 604,927.

I claim and desire to protect by Letters Patent is as follows:

1. The process of preparing an active depolarizlng material tor alkaline storage batteries, which consists in mixing hydroxid of nickel with freshly precipitated hydroxid of bismuth, and then drying the mixture, substantially as described.

2. The process of preparing an active depolarizing material for alkaline storage batteries, which consists in precipitating nickel hydroxid from one solution and bismuth hydroxid from another solution, then thoroughly mixing the two precipitates before either is dried, and drying the mixture, substantially as described.

3. The process of preparing an active depolarizing material for alkaline storage batteries, which consists in mixing freshly precipitated hydroxids of nickel and bismuth, then drying, washing, and finally redrying the. mixture, substantially as described.

4. The process of preparing an active depolarizing material for alkaline storage batteries, which consists in precipitating nickel hydroxid from one solution and bismuth hydroxid from another solution, then thoroughly mixing the two precipitates before either is dried, then washing, drying, and

finally redrying the mixture, substantially as described.

5. The process of preparing an active depolarizing material ior alkaline storage batteries, which consists in mixing an oxygen compound of nickel with freshly precipitated hydroxid of bisn'luth. and drying the mixture, substantially as described.

This specification signed and witnessed this 25th day of January 1911.

THOMAS A. EDISON.

Witnesses:

DYER SMITH, ANNA R. KLEHM. 

